Coercivity and stability results for an extended Navier-Stokes system

In this paper, we study a system of equations that is known to extend Navier-Stokes dynamics in a well-posed manner to velocity fields that are not necessarily divergencefree. Our aim is to contribute to an understanding of the role of divergence and pressure in developing energy estimates capable of both controlling the nonlinear terms, and being useful at the time-discrete level. We address questions of global existence and stability in bounded domains with no-slip boundary conditions. Through use of new H1 coercivity estimates for the linear equations, we establish a number of global existence and stability results, including results for small divergence and a timediscrete scheme. We also prove global existence in 2D for any initial data, provided sufficient divergence damping is included. C © 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4738637]